On Fri, Oct 08, 2004 at 08:28:12PM -0400, John Weiss wrote:
> On Fri, Oct 08, 2004 at 10:21:02PM +0200, Lars Gullik Bjønnes wrote:
> >
> > How do you decalre a namespace in a DTD?
Okay, just read up on XML namespaces.
- A namespace is uniquely identified by a URL. Doesn't have to be an
HTTP-resolvable URL; it's just a label.
- Unlike C++ namespaces, in XML, the "name" of the namespace is just
an in-doc label.
- The namespace is "defined" as a special attribute on any element,
and is "visible" only to the subtree rooted at that element.
Ususally, you define all of your namespaces on the root node.
- You define a namespace with this special attribute:
"xmlns:" + ns_defn_name "=\"" + namespaceURL_ID + "\""
... where `ns_defn_name' is the label you're going to use for the
namespace and `namespaceURL_ID' is the URL that uniquely identifies
the namespace
What all of that gobbledygook means is that you could define the
"special_chars" namespace as:
<body xmlns:special_chars="http://www.lyx.org/special_chars_ns/";>
or as:
<body xmlns:sc="http://www.lyx.org/special_chars_ns/";>
or even as:
<body xmlns:sc="http://www.lyx.org/special_chars_ns/";>
- The actual element and attribute names are defined in a regular old
DTD.
At this point, I get a bit unsure. I *think* you don't need to
qualify the namespace members with the `namespace_name + ":"'. I
could be wrong.
I'm also not too clear on how you include this DTD into the
document. All I know is that the URL used to uniquely identify the
namespace ... has nothing whatsoever to do with it. Yeah, I know.
Weird, huh?
I do know that XSchema has far better namespace support. However, now
I'm beginning to doubt the utility of namespaces over nested element
tags. *sigh*
--
John Weiss
